VoiceProcessingIO : intermittent startup difficulties
VoiceProcessingIO : intermittent startup difficulties
- Subject: VoiceProcessingIO : intermittent startup difficulties
- From: Zachary Kulis <email@hidden>
- Date: Wed, 13 Oct 2010 09:37:34 -0400
I am using the VoiceProcessingIO for recording, as it seems to boost the
input gain on the microphone and deliver a higher SNR than the RemoteIO
unit. I am also using the PlayAndRecord category and an AUGraph with a
mixer connected.
My problem is that occasionally, after starting the AU graph, my input
callback is never called. The output (render) callback is called
normally, but I never get a notification that recorded samples are
ready! Also, when this issue occurs, a red flashing bar often appears at
the top of the screen, and there is no way to dismiss it (with the
exception of rebooting the device).
If I disable the VoiceProcessingIO unit and use the RemoteIO unit
instead, the issue does not occur -- my input callback is called
normally. Also, I never observe the problem when using the simulator
(VoiceIO or RemoteIO). This leads me to believe that the issue is not
with my code.
I was just wondering if anyone has ever run into this (or a similar)
issue while using the VoiceProcessingIO unit with the PlayAndRecord
category. I'm developing/testing with the iOS4.0 SDK and running my app
on an iPod Touch 2G.
Thanks,
Zach
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